Chemical waste suction truck

Abstract

We provide a chemical waste suction vehicle capable of sucking up chemical waste liquid and storing it in a tank. [Solution] The chemical waste suction vehicle 100 includes a diaphragm pump 2 for sucking and discharging chemical waste, a first strainer 20 installed at the tip of the suction pipe for removing foreign matter from the object to be sucked, a second strainer 11 installed on the suction port side of the diaphragm pump 2 for protecting the inside of the pump, a switching means including a valve for selectively switching between the suction flow path and the discharge flow path, and a tank 5 capable of containing chemical waste. By switching the valve included in the switching means, the flow within the diaphragm pump 2 is made to be in the same direction during suction and discharge.

Description

Technical Field

[0001] The present invention relates to a suction vehicle for sucking and discharging chemical waste liquid, and particularly to a technology that enables safe and efficient collection and transportation of chemical waste liquid.

Background Art

[0002] Chemical waste liquids include, for example, the following types. Waste acids (e.g., used acid liquids such as sulfuric acid, hydrochloric acid, nitric acid, etc.) Waste alkalis (e.g., used alkali liquids such as sodium hydroxide solution, potassium hydroxide solution, etc.) Organic solvent waste liquids (e.g., used organic solvents such as toluene, methanol, acetone, etc.) Chemical reaction product waste liquids (e.g., waste liquids remaining after catalytic reactions, unused reaction liquids generated in industrial processes) Metal processing waste liquids (e.g., etching liquids, waste liquids after degreasing and cleaning) Due to their nature, these waste liquids often have corrosiveness, toxicity, and volatility, and appropriate collection and treatment are required.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, conventional suction vehicles often do not have sufficient corrosion resistance, which causes several problems. First, in the suction and transportation of chemical waste liquid, acidic or alkaline liquids come into contact with pumps, pipes, and the inner wall of the tank, causing corrosion to progress and significantly shortening the life of the device. In particular, when handling strongly acidic or strongly alkaline waste liquids, the members are damaged in a short period, increasing the risk of leakage and breakage.

[0005] Next, deterioration of the equipment due to corrosion leads to a decrease in suction capacity, resulting in reduced work efficiency. Furthermore, frequent emergency repairs and replacements due to equipment failures increase maintenance costs.

[0006] Furthermore, leakage of waste liquid from corroded components can lead to environmental pollution and safety problems, posing a significant risk, especially when handling highly hazardous chemical waste. As described above, conventional suction trucks suffer from significant challenges in terms of reliability, safety, and economic efficiency due to their insufficient corrosion resistance.

[0007] Therefore, the present invention aims to provide a chemical waste suction vehicle capable of sucking up chemical waste liquid and storing it in a tank.

[0008] Incidentally, the invention described in Patent Document 1 relates to a fuel delivery tank truck, and is primarily intended for the safe and efficient delivery of flammable liquids such as methanol fuel and kerosene. This tank truck is equipped with an air compressor and an air tank, and has a configuration that uses compressed air in the air tank to drive an air-driven diaphragm pump. The air compressor is operated by a hydraulic pump and a hydraulic motor, and the generated compressed air is supplied to the air tank. The compressed air in the air tank is supplied to the air-driven diaphragm pump via a control valve, which sucks in and discharges fuel. The fuel is filtered to remove dust and debris by a strainer, measured by a flow meter, and then supplied to the destination tank through a refueling hose. This configuration improves fuel safety and delivery efficiency.

[0009] On the other hand, the present invention relates to a suction vehicle for safely and efficiently suctioning and discharging chemical waste liquid. Its configuration includes a diaphragm pump for suctioning and discharging chemical waste liquid, an air compressor for supplying compressed air, and an air tank. A first strainer for removing foreign matter is installed at the tip of the suction pipe, and a second strainer for protecting the inside of the pump is installed on the suction port side of the diaphragm pump. The flow path is switched by a switching means including a three-way valve suction port valve, a three-way valve suction / pressure switching valve, and a three-way valve pressure feeding / gravity discharge valve. These valves are electrically operated and can be automatically switched by a control means. The tank is made of corrosion-resistant material and can withstand the corrosiveness of chemical waste liquid. Thus, the present invention achieves safe and efficient suction and discharge while ensuring corrosion resistance, foreign matter removal function, and one-way flow of the flow path that are adapted to the characteristics of chemical waste liquid.

[0010] The invention described in Patent Document 1 and the present invention share the common feature of using an air-driven diaphragm pump to efficiently transport liquids, but there are clear differences in their applications and designs. The invention described in Patent Document 1 is intended for fuel delivery tank trucks and is primarily aimed at safely transporting flammable fuels. On the other hand, the present invention is intended for the suction and discharge of chemical waste liquids and is characterized by a corrosion-resistant configuration. Furthermore, while the invention described in Patent Document 1 uses a control valve to suction and discharge fuel, the present invention combines a three-way valve and control means to automatically switch the flow path, and is designed so that the flow is unidirectional during suction and discharge. In addition, the present invention differs in that it addresses the specific challenges of chemical waste liquids by providing strainers at the tip of the suction pipe and on the pump suction port side to remove foreign matter and protect the pump. [Means for solving the problem]

[0011] To solve the above problems, the present invention has the following features. The present invention It is a chemical wastewater suction vehicle, A diaphragm pump for aspirating and discharging chemical waste liquid, A first strainer is installed at the tip of the suction tube to remove foreign matter from the object being aspirated, A second strainer is installed on the suction port side of the diaphragm pump to protect the inside of the pump, A switching means including a valve for selectively switching between a suction channel and a discharge channel, It is equipped with a tank capable of containing chemical waste liquid, The switching mechanism is characterized by switching a valve included in it to make the flow within the diaphragm pump in the same direction during both suction and discharge.

[0012] Preferably, The switching mechanism is A three-way valve suction port valve located upstream of the diaphragm pump. A three-way valve suction / pressure switching valve located downstream of the diaphragm pump, and Includes a three-way valve pressure feed / gravity discharge valve positioned upstream of the diaphragm pump, The three-way valve suction port valve is switched to connect to the diaphragm pump side when suction is in progress. The three-way valve suction / pressure switching valve is switched so that it is connected to the tank side when suction is active and to the drain port side when discharge is active. It would be desirable for the three-way valve pressure-feed / gravity discharge valve to be switchable to connect to the diaphragm pump side when discharging.

[0013] Preferably, the three-way valve pressure-feed / gravity discharge valve included in the switching means can be switched to form a flow from the tank to the outlet when gravity discharge is in operation.

[0014] Preferably, the chemical wastewater suction vehicle is equipped with an air compressor and an air tank. The compressed air generated by the operation of the air compressor is supplied to the air tank. The diaphragm pump is preferably driven by compressed air supplied from an air tank.

[0015] Preferably, the three-way valve suction port valve, the three-way valve suction / discharge switching valve, and the three-way valve pressure feed / gravity discharge valve included in the switching means may be automatically operable valves.

[0016] Preferably, the chemical waste liquid suction vehicle is provided with control means. The control means switches the three-way valve suction port valve, the three-way valve suction / discharge switching valve, and the three-way valve pressure feed / gravity discharge valve. During suction, the three-way valve suction port valve is switched to the diaphragm pump side, and the three-way valve suction / discharge switching valve is switched to the tank side. During discharge, the three-way valve suction port valve is switched to close the suction port side, the three-way valve suction / discharge switching valve is switched to the drain port side, and the three-way valve pressure feed / gravity discharge valve is switched to the diaphragm pump side.

[0017] Preferably, during gravity discharge, the control means switches the three-way valve pressure feed / gravity discharge valve to form a flow from the tank to the discharge port.

[0018] Further, the present invention is A chemical waste liquid suction vehicle, A diaphragm pump for sucking and discharging chemical waste liquid, Switching means including a valve for selectively switching a suction flow path and a discharge flow path, A tank capable of storing chemical waste liquid, By switching the valve included in the switching means, the flow in the diaphragm pump is made in the same direction during suction and discharge.

Effects of the Invention

[0019] The chemical waste liquid suction vehicle of the present invention can suck chemical waste liquid and store it in a tank.

[0020] The chemical waste liquid suction vehicle of the present invention can control the suction and discharge flows in one direction, so that efficient switching of the flow path is possible, and safe and reliable transfer of chemical waste liquid is realized.

[0021] By employing a switching mechanism that includes a three-way valve, the flow path can be precisely controlled during suction and discharge, improving the overall operability and reliability of the device.

[0022] The configuration, which switches between a three-way valve pressurized feed and a gravity discharge valve during gravity discharge, enables simple and efficient discharge, contributing particularly to operation with reduced energy consumption.

[0023] By driving a diaphragm pump using an air compressor and air tank, stable suction and discharge performance is achieved, enabling the safe transfer of chemical waste liquids.

[0024] By employing automatically operated valves, flow path switching can be performed quickly and accurately, improving work efficiency and ease of operation.

[0025] By using a control mechanism to switch the flow path, valve operation during suction and discharge is automated, reducing the burden on the operator and improving the overall operational efficiency of the device.

[0026] When gravity discharge occurs, the control system appropriately switches the three-way valve, enabling automatic control of the flow path and increasing operational flexibility and efficiency.

[0027] By controlling the suction and discharge flows in the same direction, the transfer of chemical waste liquids is simplified, improving safety and reliability.

[0028] The purpose, features, structure, operation, and effects of the present invention and its embodiments will become even clearer from the following detailed description in reference to the accompanying drawings. [Brief explanation of the drawing]

[0029] [Figure 1] Figure 1 is a side view of the chemical waste suction vehicle 100. [Figure 2] Figure 2 is a plan view of the chemical waste liquid suction vehicle 100. [Figure 3] Figure 3 is a diagram of the chemical waste suction vehicle 100. [Figure 4]Figure 4 shows the operation and flow of each valve in the chemical wastewater suction vehicle 100 during suction, pressurized drainage, and gravity drainage. [Modes for carrying out the invention]

[0030] As shown in Figures 1, 2, and 3, the chemical waste suction vehicle 100 is constructed on a chassis 1 and is equipped with a diaphragm pump 2 for sucking up and discharging chemical waste, as well as an air compressor 3 and an air tank 4. The air compressor 3 is operated by the vehicle's PTO (power take-off). A receiver tank 5 is provided for temporarily storing the chemical waste, and is equipped with an inspection port 6 and a level sensor 7.

[0031] Tank 2 is a crucial component for temporarily containing chemical waste liquid and is constructed from corrosion-resistant materials to handle highly corrosive chemical waste. For example, polyvinyl chloride (PVC), heat-resistant polyvinyl chloride (CPVC), polyvinyl fluoride (PVDF), and corrosion-resistant stainless steel (SUS316L) are used for the inner walls and other parts. Furthermore, a level sensor 7 is installed inside the tank to detect the liquid level, allowing for real-time monitoring of the waste liquid volume. An inspection port 6 is provided for easy maintenance and cleaning.

[0032] A suction valve 8, a pressure / gravity drain valve 9, and a suction / pressure switching valve 10, all of which are three-way valves, are installed along the flow path, and the flow path is switched by these switching means. The suction valve 8, the pressure / gravity drain valve 9, and the suction / pressure switching valve 10 require corrosion resistance. The valve seats require chemical resistance and heat resistance, so appropriate materials such as PTFE (Teflon®), fluororubber (FKM), ethylene propylene rubber (EPDM), nitrile rubber (NBR), PFA (perfluoroalkoxyalkane), UHMWPE (ultra-high molecular weight polyethylene), and metal materials such as stainless steel and Inconel, as well as ceramics, are used.

[0033] A first strainer 20 is provided at the tip of the suction port 13, and a second strainer 11 is positioned on the suction port side of the diaphragm pump to remove foreign matter and protect the device. The first strainer 20 is responsible for removing large foreign matter from the object being aspirated. The second strainer 11 removes fine foreign matter to protect the inside of the pump. This prevents pump failure and blockage of the flow path, improving the overall durability of the device.

[0034] The control panel 12 is connected to electric actuators for controlling each valve, and controls each valve according to the conditions of stopping, suction, pressurized discharge, and gravity drainage.

[0035] Furthermore, the first pipe 15 to the fifth pipe 19 are properly connected to form a suction channel and a discharge channel. This configuration enables the chemical waste suction vehicle 100 to safely and efficiently suction and discharge chemical waste.

[0036] The piping is designed to accommodate chemical wastewater channels, and corrosion-resistant materials (PVC, fluororesin, or PVC coating) are used. Each pipe is designed to work in conjunction with a fluid control valve to ensure proper separation of suction and discharge channels and to guarantee one-way flow. High-performance gaskets and chemical-resistant adhesives are used at pipe joints.

[0037] The diaphragm pump 2 is configured to operate using an air compressor 3 and an air tank 4. First, the air compressor 3 starts up, taking in ambient air and compressing it. The generated compressed air is supplied to the air tank 4 and temporarily stored there. The air tank 4 plays the role of supplying compressed air at a stable pressure. The stored compressed air is supplied to the diaphragm pump 2 by a control means (not shown) in response to instructions from the control panel 12, and the diaphragm operates alternately using the force of this compressed air to perform suction and discharge.

[0038] The diaphragm pump 2 is the main drive unit for aspirating and discharging chemical waste liquid. Because it is driven using compressed air, it does not use an electric motor and offers excellent explosion-proof properties. The diaphragm inside the pump comes into direct contact with the chemical waste liquid, so it is manufactured from rubber or fluororesin that combines chemical resistance and abrasion resistance. It evenly distributes the pressure difference during suction and discharge, enabling efficient transfer of the waste liquid.

[0039] During suction, compressed air is supplied to one side of the diaphragm, causing it to move and creating negative pressure inside the pump. This negative pressure draws the chemical waste liquid in through the suction port and into the pump. Next, during discharge, compressed air is supplied to the opposite side of the diaphragm, causing it to move in the opposite direction and pushing the chemical waste liquid out of the pump. This pushed-out liquid is then sent to the discharge channel.

[0040] This alternating cycle of suction and discharge enables the continuous transfer of chemical waste liquid. By utilizing the air compressor 3 and air tank 4, the diaphragm pump 2 achieves stable operation, allowing for safe and efficient suction and discharge of chemical waste liquid.

[0041] Next, we will explain the lineage with reference to Figures 3 and 4. During suction, the chemical waste liquid is drawn in through a suction hose (not shown) and a first strainer 20 from the suction port 13 and flows into the third pipe 17 through the suction port valve 8. It then passes through a second strainer 11 to remove foreign matter and reaches the suction port of the diaphragm pump 2 via the fourth pipe 18. Once the chemical waste liquid is pressurized by the diaphragm pump 2, it is sent through the fifth pipe 19 to the suction / pressure switching valve 10 and then into the receiver tank 5 via the second pipe 16. This flow path is controlled to be unidirectional, ensuring efficient and safe suction.

[0042] During pressurized discharge, the chemical waste liquid starts from the receiver tank 5 and flows into the suction valve 8 through the pressurized / gravity drain valve 9. It then passes through the third pipe 17 and the second strainer 11 to remove foreign matter. Next, it enters the diaphragm pump 2 through the fourth pipe 18, is pressurized, and sent to the suction / pressure switching valve 10 via the fifth pipe 19. From there, it passes through the first pipe 15 and is finally discharged from the pressurized drain and gravity drain ports 14. This flow path is also controlled to be one-way, enabling efficient and safe pressurized discharge.

[0043] During gravity discharge, the chemical waste liquid starts from the receiver tank 5 and proceeds directly to the pressurized drain and gravity drain outlet 14 via the pressurized / gravity drain valve 9. In this system, a simple discharge using gravity is performed without using the diaphragm pump 2.

[0044] Figure 4 illustrates the orientation of the three-way valves of each valve during operation on the system described above. The valves are switched automatically based on commands from the control panel 12. Each valve has an electric mechanism that accurately switches the flow path during suction and discharge based on the command.

[0045] The chemical waste suction vehicle of this embodiment achieves high resistance to highly acidic and highly alkaline chemical waste by employing highly corrosion-resistant materials for parts that come into contact with the chemical waste, such as the tank, piping, valves, and strainers. This extends the lifespan of the device and reduces the risk of accidents due to waste leakage. Furthermore, by using a switching mechanism including a three-way valve, the suction and discharge flows can be controlled to be unidirectional, enabling efficient and reliable transfer of chemical waste.

[0046] Furthermore, the first and second strainers reliably remove foreign matter and fine particles from the aspirated material, preventing clogging and damage to the diaphragm pump and piping, and improving the overall reliability of the system. The system automatically controls each valve and pump via the control panel, reducing the burden on the operator, and enabling accurate and rapid switching of flow paths, thereby improving work efficiency.

[0047] Furthermore, because the diaphragm pump is driven by compressed air, it offers excellent explosion-proof properties, ensuring safety even when handling highly volatile chemical waste. In addition, it supports both pressurized and gravity discharge, allowing for flexible operation according to site conditions and work content. This configuration enables the continuous and efficient transfer of chemical waste, allowing for the rapid processing of large quantities of waste.

[0048] Thus, the chemical waste suction vehicle of this embodiment is a device that excels in safety, reliability, and work efficiency, and is able to solve the problems of the conventional technology.

[0049] (Variations of the tank) The tank in the chemical waste suction vehicle of the present invention can be modified in the following ways.

[0050] Tank materials can include polyvinyl chloride (PVC), heat-resistant CPVC, polyvinyl fluoride (PVDF), and corrosion-resistant stainless steel (SUS316L), as well as epoxy-coated steel sheets and FRP (fiberglass reinforced plastic). Furthermore, if high-temperature operation is required, heat-resistant materials such as Inconel and titanium alloys can be used.

[0051] Furthermore, the shape of the tank can be changed to various shapes such as cylindrical, cubic, or elliptical, depending on the installation space and intended use. It is also possible to create flat tanks that match the shape of the vehicle, or structures that increase capacity by connecting multiple tanks.

[0052] The inner walls of the tank can be lined with fluororesin (PTFE, ETFE, etc.) or rubber to improve resistance to chemical waste liquids. Furthermore, multiple layers of coating can be applied depending on the type of waste liquid to enhance resistance to specific chemical substances.

[0053] The tank capacity can also be changed according to the amount of chemical waste liquid being transported. For example, the tank capacity can be reduced for smaller vehicles, or multiple tanks can be connected to increase the capacity for larger vehicles.

[0054] Furthermore, by installing an agitator inside the tank, it is possible to prevent the separation and sedimentation of chemical waste liquids, and to add a temperature control function to promote the reaction of specific chemical waste liquids. In addition, by making the tank detachable from the vehicle, flexible operation is possible, such as using it as a fixed tank after transport.

[0055] In addition, by installing temperature and pH sensors in addition to the liquid level sensor inside the tank, the state of the chemical waste liquid can be monitored in real time. Different types of liquid level sensors, such as ultrasonic, capacitive, and optical sensors, can be used to accommodate various environmental conditions and waste liquid characteristics.

[0056] (Modified examples of diaphragm pumps and drive systems) The diaphragm pump in this invention can be modified in the following ways. First, regarding the diaphragm material, rubber (EPDM or nitrile rubber), fluororesin (PTFE), and even metal diaphragms can be used to enhance chemical resistance and abrasion resistance. In particular, when considering use in high-temperature and high-pressure environments, durability can be improved by using metal diaphragms or multi-layered diaphragms.

[0057] Next, regarding the pump's drive system, in addition to the air-driven system using compressed air, it is also possible to change to a hydraulic or electric drive system. For example, a hydraulic drive system is effective when strong suction or discharge force is required, while an electric drive system eliminates the need for an air compressor or air tank, simplifying the configuration.

[0058] Regarding the pump's structure, in addition to a configuration using a single diaphragm, it is possible to employ a structure in which multiple diaphragms are arranged in series or parallel to improve suction and discharge efficiency. This allows for the rapid transfer of large volumes of waste liquid.

[0059] Furthermore, regarding pump control, the pump's operation can be optimized by incorporating flow and pressure sensors to monitor the flow rate and pressure of the chemical waste liquid in real time. In addition, by adding a function to adjust the suction and discharge speeds according to the characteristics of the fluid, it is possible to provide flexibility to handle a variety of chemical waste liquids.

[0060] The placement of the diaphragm pump can also be modified depending on the vehicle's space and intended use. For example, if installed near the tank, the length of the piping can be shortened to improve efficiency, while if installed at the rear or side of the vehicle, maintainability can be improved.

[0061] By applying PTFE coating or fluororesin lining as surface treatments to the inside of the pump, resistance to highly corrosive chemical waste liquids can be further improved.

[0062] (Variation of foreign object removal method) In this embodiment, modifications are described that are not limited to a configuration using a first strainer 20 and a second strainer 11 as means for removing foreign matter in the chemical waste suction vehicle 100. This allows the invention to be not limited to a specific means for removing foreign matter and to have a wide range of applications.

[0063] A configuration that omits the strainer is conceivable. This configuration is applicable when the chemical waste liquid to be aspirated contains little to no foreign matter and does not affect the function of the pump or piping. In such a configuration, the installation and cleaning of the strainer are unnecessary, simplifying the overall configuration of the device, as well as reducing manufacturing costs and improving maintainability.

[0064] As a means of removing foreign matter, a high-precision filter unit can be used instead of a strainer. This filter unit has the ability to remove fine foreign matter from chemical waste liquids and can improve foreign matter removal performance compared to a strainer. Furthermore, by making it a variable structure in which the mesh size of the filter can be changed according to the characteristics of the fluid, it can be used for a wider range of applications.

[0065] Furthermore, a configuration incorporating a cyclone separation device is also conceivable. This configuration utilizes centrifugal force to efficiently separate solid particles from chemical wastewater, enabling rapid processing of large volumes of wastewater. This method is particularly effective in environments with a high concentration of foreign matter.

[0066] When handling chemical waste liquids containing magnetic foreign matter, it is advisable to install a magnetic filter. This configuration effectively removes magnetic particles that are difficult to handle with strainers. This reduces the accumulation of foreign matter in pumps and piping, thereby improving the reliability of the equipment.

[0067] By directly attaching a mesh or filter to the tip of the suction port 13, a configuration that omits the first strainer 20 can also be realized. In this case, since foreign matter can be removed at the suction port, the overall weight and size of the device can be reduced. Furthermore, by improving the foreign matter resistance on the suction port side of the diaphragm pump 2, it is also possible to omit the second strainer 11.

[0068] Even when using a strainer, the following modifications are possible. By adopting a variable strainer, flexible responses can be made according to the characteristics and particle size of the chemical waste liquid. Furthermore, by using a strainer with an automatic cleaning function, clogging can be prevented and continuous operation can be achieved. In addition, by creating a system in which the strainer and filter are integrated, the number of parts can be reduced while improving the foreign matter removal performance.

[0069] Thus, the means for removing foreign matter in the chemical waste suction vehicle 100 is not limited to a strainer, but can be changed to various means and configurations.

[0070] (Valve torture) In this embodiment, a three-way valve is used as a means of switching the flow path of the chemical waste suction vehicle 100, but modifications using other types of valves are conceivable. This allows for a flexible design that is not dependent on a specific valve structure.

[0071] First, instead of a three-way valve, a configuration using multiple two-way valves can be considered. In this case, the same functionality as a three-way valve can be achieved by controlling the switching of the flow paths by opening and closing the two-way valves. This configuration has the advantage of allowing independent control of each flow path, making it easier to handle complex fluid control.

[0072] Furthermore, a configuration using a four-way valve is also possible. Because a four-way valve can switch multiple flow paths simultaneously, it is possible to achieve a variety of flow path configurations with fewer valves than with a three-way valve. This configuration is suitable when space is limited or when a complex flow path design is required.

[0073] Furthermore, by employing a rotary valve, it is possible to configure the system to switch flow paths through rotational motion. Because rotary valves can smoothly control fluid flow, flow loss can be minimized. This configuration is also suitable for handling high-viscosity chemical waste liquids.

[0074] Furthermore, using a piston valve allows for linear flow path switching. Piston valves are suitable for use in high-pressure environments and may be more durable than three-way valves. Additionally, electrically controlling the piston's movement can further improve the precision of automation.

[0075] From an automation perspective, each valve can be equipped with an actuator, enabling switching via electric, pneumatic, or hydraulic drive. By expanding the options for such drive mechanisms, it is possible to provide an optimal configuration tailored to the work site and operating environment.

[0076] The valve material can also be modified to suit the characteristics of the chemical waste liquid. For applications requiring corrosion resistance, valves with PTFE lining or PVDF coating can be used. Furthermore, for use in high-temperature and high-pressure environments, valves made of Inconel or stainless steel are suitable.

[0077] Thus, the flow path switching means in the chemical waste suction vehicle 100 is not limited to a three-way valve, but can be replaced with other types of valves such as a two-way valve, a four-way valve, a rotary valve, or a piston valve.

[0078] Although the present invention has been described in detail above, the above description is merely illustrative in all respects and is not intended to limit its scope. Needless to say, various improvements and modifications can be made without departing from the scope of the present invention. Each constituent element of the invention disclosed herein shall stand as an independent and standalone invention. Inventions that combine each constituent element in any way shall also be included in the present invention. The specific expressions in this specification are merely illustrative, and the present invention shall also include conceptualizations of such illustrative expressions. [Industrial applicability]

[0079] This invention relates to a chemical wastewater suction vehicle, which is industrially applicable. [Explanation of Symbols]

[0080] 100 Chemical waste liquid suction trucks 1 Chassis 2. Diaphragm pump 3. Air compressor 4 air tanks 5 Receiver Tank 6 Inspection hatch 7-level sensor 8. Inlet valve (three-way valve) 9. Pressure-feed / gravity drain valve (three-way valve) 10. Suction / Pressure Switching Valve (Three-Way Valve) 11. Second Strainer 12 Control panel 13 Inlet 14. Pressure drain and gravity drain 15. First Piping 16. Second Piping 17. Third Piping 18. Fourth pipe 19. Fifth piping 20 First Strainer

Claims

1. It is a chemical wastewater suction vehicle, A diaphragm pump for aspirating and discharging chemical waste liquid, A first strainer is installed at the tip of the suction tube to remove foreign matter from the object to be suctioned, A second strainer is installed on the suction port side of the diaphragm pump to protect the inside of the pump, A switching means including a valve for selectively switching between a suction channel and a discharge channel, It is equipped with a tank capable of containing chemical waste liquid, A chemical wastewater suction vehicle characterized by switching a valve included in the switching means to make the flow within the diaphragm pump in the same direction during suction and discharge.

2. The switching means, A three-way valve suction port valve located upstream of the diaphragm pump. A three-way valve suction / pressure switching valve located downstream of the diaphragm pump, and Includes a three-way valve pressure feeding / gravity discharge valve positioned upstream of the diaphragm pump, The aforementioned three-way valve suction port valve is switched to connect to the diaphragm pump side when suction is performed. The aforementioned three-way valve suction / pressure switching valve is switched so that it is connected to the tank side during suction and to the drain port side during discharge. The chemical waste liquid suction vehicle according to claim 1, characterized in that the three-way valve pressure feeding / gravity discharge valve can be switched to connect to the diaphragm pump side when discharged.

3. The chemical waste suction vehicle according to claim 2, characterized in that the three-way valve pressure feeding / gravity discharge valve included in the switching means is switched to form a flow from the tank to the discharge port when gravity discharge is performed.

4. The aforementioned chemical wastewater suction vehicle is equipped with an air compressor and an air tank. The compressed air generated by the operation of the air compressor is supplied to the air tank. The chemical waste liquid suction vehicle according to claim 1, characterized in that the diaphragm pump is driven by compressed air supplied from the air tank.

5. The chemical waste suction vehicle according to claim 1, characterized in that the three-way valve suction port valve, the three-way valve suction / pressure switching valve, and the three-way valve pressure feeding / gravity discharge valve included in the switching means are valves that can be operated automatically.

6. The aforementioned chemical wastewater suction vehicle is equipped with a control means, The control means switches the three-way valve suction port valve, the three-way valve suction / pressure switching valve, and the three-way valve pressure feeding / gravity discharge valve, During suction, the three-way valve suction port valve is switched to the diaphragm pump side, and the three-way valve suction / pressure switching valve is switched to the tank side. The chemical waste suction vehicle according to claim 5, characterized in that, when discharging, the three-way valve suction port valve is switched to close the suction port side, the three-way valve suction / pressure switching valve is switched to the drain port side, and the three-way valve pressure / gravity discharge valve is switched to the diaphragm pump side.

7. The chemical waste suction vehicle according to claim 6, characterized in that the control means switches the three-way valve pressurized / gravity discharge valve to form a flow from the tank to the discharge port when gravity discharge occurs.

8. It is a chemical wastewater suction vehicle, A diaphragm pump for aspirating and discharging chemical waste liquid, A switching means including a valve for selectively switching between a suction channel and a discharge channel, It is equipped with a tank capable of containing chemical waste liquid, A chemical wastewater suction vehicle characterized by switching a valve included in the switching means to make the flow within the diaphragm pump in the same direction during suction and discharge.

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